单项选择题

A．The woman knows the professor has been busy.
B．The woman regrets having taken up much of the professor’s time.
C．The woman has trouble getting along with the professor.
D．The woman knows the professor has run into trouble.
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单项选择题
A．They lifecycle of trees.B．The number of trees.C．The intensity of solar burning.D．The quality of air.
A．They lifecycle of trees.
B．The number of trees.
C．The intensity of solar burning.
D．The quality of air.
单项选择题
A．They want to sleep well at night.B．Their parents want them to do so.C．They fall far behind the others.D．They know that training is very important.
A．They want to sleep well at night.
B．Their parents want them to do so.
C．They fall far behind the others.
D．They know that training is very important.
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